Xinhua News Agency reported that researchers have long found that compared with cesarean section, natural delivery is more beneficial to the health of babies. But for various reasons, many healthy pregnant women still choose cesarean section. American researchers believe that if healthy pregnant women choose cesarean section, it's best to do it in the 39th week of pregnancy. Babies born during this period are less likely to suffer from various diseases than those born in the 37th or 38th week through cesarean section.